Summary of Refranchising and Franchise Acquisitions - Additional Information (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 24, 2020 USD ($) restaurants	Mar. 26, 2019 USD ($) franchise restaurants	Dec. 31, 2019 restaurants
Franchise Acquisitions [Abstract]
Business combination recognized identifiable assets acquired and liabilities assumed, operating lease right of use assets		$ 858
Business combination recognized identifiable assets acquired and liabilities assumed, operating lease liabilities		$ 858
Significant Changes, Franchises Purchased During Period | franchise		3
Goodwill, Acquired During Period	$ 2,672
Company-operated restaurants sold to franchisees | restaurants	5	13
Assets Held For Sale, Restaurants Reclassified To Held For Use | restaurants	14
Assets Held For Sale, Loss From Reclassification	$ 500
Assets Held For Sale, Restaurants Classified As Held For Sale | restaurants			19
Below Market Lease, Acquired	$ 130